/* Cymatics Simulator - Dark Theme Styles */

/* CSS Variables for Dark Theme */
:root {
  --bg-primary: #000000;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a25;
  --bg-panel: #15151f;
  
  --text-primary: #e8e8f0;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  
  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-glow: rgba(99, 102, 241, 0.3);
  
  --border-color: #2a2a3a;
  --border-focus: #6366f1;
  
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
}

/* Reset and Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}


/* Layout */
.app-container {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  min-height: 100vh;
}

.main-content {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-flex: 1;
  -ms-flex: 1;
  flex: 1;
  gap: 1rem;
  padding: 1rem;
}

/* Control Panel */
.control-panel {
  width: 280px;
  background: var(--bg-panel);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  gap: 1.5rem;
  border: 1px solid var(--border-color);
}

/* Custom Scrollbar Styling */
.control-panel::-webkit-scrollbar {
  width: 6px;
}

.control-panel::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
  border-radius: 3px;
}

.control-panel::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
  transition: background var(--transition-fast);
}

.control-panel::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* Firefox scrollbar */
.control-panel {
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) var(--bg-tertiary);
}

.control-section {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  gap: 0.75rem;
}

.control-section h3 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

/* Visualization Canvas */
.visualization-container {
  -webkit-box-flex: 1;
  -ms-flex: 1;
  flex: 1;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
  position: relative;
}

#visualization-canvas {
  max-width: 100%;
  max-height: 100%;
  background: var(--bg-primary);
}

/* Buttons */
.btn {
  display: -webkit-inline-box;
  display: -ms-inline-flexbox;
  display: inline-flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  -webkit-transition: all var(--transition-fast);
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--accent-primary);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-secondary);
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--accent-primary);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
}

.btn.recording {
  background: var(--error);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Source Buttons */
.source-buttons {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.source-buttons .btn {
  -webkit-box-flex: 1;
  -ms-flex: 1;
  flex: 1;
  min-width: calc(50% - 0.25rem);
}

.source-buttons .btn.active {
  background: var(--accent-primary);
  color: white;
}

/* Sliders */
.slider-container {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  gap: 0.5rem;
}

.slider-label {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
  font-size: 0.875rem;
}

.slider-value {
  color: var(--accent-primary);
  font-weight: 600;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--accent-primary);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 10px var(--accent-glow);
  transition: transform var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--accent-primary);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

/* Color Picker */
.color-controls {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  gap: 1rem;
}

input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  background: transparent;
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

input[type="color"]::-webkit-color-swatch {
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
}

/* Checkbox Toggle */
.toggle-container {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  gap: 0.75rem;
}

.toggle {
  position: relative;
  width: 44px;
  height: 24px;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-tertiary);
  border-radius: 12px;
  transition: var(--transition-fast);
}

.toggle-slider::before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background: var(--text-secondary);
  border-radius: 50%;
  -webkit-transition: var(--transition-fast);
  transition: var(--transition-fast);
}

.toggle input:checked + .toggle-slider {
  background: var(--accent-primary);
}

.toggle input:checked + .toggle-slider::before {
  -webkit-transform: translateX(20px);
  transform: translateX(20px);
  background: white;
}

/* Capture Buttons */
.capture-buttons {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 0.75rem;
}

.capture-buttons .btn {
  -webkit-box-flex: 1;
  -ms-flex: 1;
  flex: 1;
}

/* Recording Indicator */
.recording-indicator {
  display: none;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--error);
  color: white;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
}

.recording-indicator::before {
  content: "";
  width: 8px;
  height: 8px;
  background: white;
  border-radius: 50%;
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* Error Container */
.error-container {
  display: none;
  padding: 1rem;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--error);
  border-radius: var(--radius-md);
  color: var(--error);
  font-size: 0.875rem;
}

/* About Section - now inline in control panel, see .about-inline */

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem;
  text-align: center;
}

.footer-content {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  gap: 0.75rem;
}

.footer-links {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-primary);
}

.footer-copyright {
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Desktop Layout (> 1024px): Full side panel */
@media (min-width: 1025px) {
  .app-container {
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
  }
  
  .main-content {
    flex-direction: row;
    gap: 1.5rem;
    padding: 1.5rem;
    flex: 1;
    min-height: 0; /* Important: allows flex children to shrink */
    overflow: hidden;
  }
  
  .control-panel {
    width: 320px;
    min-width: 280px;
    max-width: 360px;
    flex-shrink: 0;
    overflow-y: auto;
    overflow-x: hidden;
    max-height: 100%;
  }
  
  /* Right side container for visualization */
  .visualization-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
  }
  
  .visualization-container {
    width: 100%;
    height: 100%;
    max-width: 800px;
    max-height: 800px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  #visualization-canvas {
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
  }
}

/* Scrollbar for visualization wrapper */
.visualization-wrapper {
  background: var(--bg-primary);
}

.visualization-wrapper::-webkit-scrollbar {
  width: 6px;
}

.visualization-wrapper::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
  border-radius: 3px;
}

.visualization-wrapper::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
  transition: background var(--transition-fast);
}

.visualization-wrapper::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

.visualization-wrapper {
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) var(--bg-tertiary);
}

/* Fullscreen button */
.fullscreen-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 40px;
  height: 40px;
  background: rgba(21, 21, 31, 0.8);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: all var(--transition-fast);
  z-index: 10;
  backdrop-filter: blur(4px);
}

.fullscreen-btn:hover {
  background: var(--bg-panel);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

/* Canvas Controls (zoom + fullscreen) */
.canvas-controls {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 10;
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.canvas-control-btn,
.canvas-controls .fullscreen-btn {
  position: relative;
  top: auto;
  right: auto;
  width: 40px;
  height: 40px;
  background: rgba(21, 21, 31, 0.8);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all var(--transition-fast);
  backdrop-filter: blur(4px);
  z-index: auto;
}

.canvas-control-btn:hover,
.canvas-controls .fullscreen-btn:hover {
  background: var(--bg-panel);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.canvas-control-btn:active,
.canvas-controls .fullscreen-btn:active {
  transform: scale(0.95);
}

/* Canvas zoom transform */
.visualization-container {
  touch-action: none;
}

#visualization-canvas {
  transform-origin: center center;
  transition: transform 0.15s ease-out;
}

/* About section inline in control panel */
.about-inline {
  border-top: 1px solid var(--border-color);
  padding-top: 1.25rem;
  margin-top: 0.5rem;
}

.about-inline h3 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.about-inline h4 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

.about-inline p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.about-inline p:last-child {
  margin-bottom: 0;
}

/* Fullscreen mode */
.visualization-container.fullscreen {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  max-width: 100vw !important;
  max-height: 100vh !important;
  min-height: 0 !important;
  z-index: 99999;
  background: var(--bg-primary);
  border-radius: 0;
  margin: 0;
  padding: 0;
  border: none;
}

.visualization-container.fullscreen #visualization-canvas {
  width: 100vw !important;
  height: 100vh !important;
  max-width: 100vw !important;
  max-height: 100vh !important;
}

.visualization-container.fullscreen .fullscreen-btn {
  top: 1.5rem;
  right: 1.5rem;
  z-index: 100000;
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.visualization-container.fullscreen .canvas-controls {
  top: 1.5rem;
  right: 1.5rem;
  z-index: 100000;
}

/* Auto-hide UI in fullscreen mode */
.visualization-container.fullscreen.ui-hidden .fullscreen-btn {
  opacity: 0;
  transform: translateY(-20px);
  pointer-events: none;
}

.visualization-container.fullscreen.ui-hidden .canvas-controls {
  opacity: 0;
  transform: translateY(-20px);
  pointer-events: none;
}

.visualization-container.fullscreen.ui-visible .fullscreen-btn {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.visualization-container.fullscreen.ui-visible .canvas-controls {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* Auto-hide controls on hover timeout (non-fullscreen) */
.visualization-container.ui-hidden .canvas-controls {
  opacity: 0;
  transform: translateY(-20px);
  pointer-events: none;
}

.visualization-container.ui-visible .canvas-controls {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* Tablet Layout (768px - 1024px): Side panel with adjusted sizing */
@media (min-width: 768px) and (max-width: 1024px) {
  .app-container {
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
  }
  
  .main-content {
    flex-direction: row;
    gap: 1rem;
    padding: 1rem;
    flex: 1;
    min-height: 0;
    overflow: hidden;
  }
  
  .control-panel {
    width: 260px;
    min-width: 240px;
    flex-shrink: 0;
    padding: 1.25rem;
    overflow-y: auto;
    overflow-x: hidden;
    max-height: 100%;
  }
  
  .visualization-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
  }
  
  .visualization-container {
    width: 100%;
    height: 100%;
    max-width: 512px;
    max-height: 512px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  #visualization-canvas {
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
  }
  
  .control-section {
    gap: 0.5rem;
  }
  
  .control-section h3 {
    font-size: 0.7rem;
  }
  
  .source-buttons .btn {
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
  }
  
  .btn {
    padding: 0.5rem 0.875rem;
    font-size: 0.8rem;
  }
}

/* Mobile Layout (< 768px): Fixed visualization, scrollable controls */
@media (max-width: 767px) {
  .app-container {
    height: 100vh;
    height: 100dvh; /* Dynamic viewport height for mobile browsers */
    overflow: hidden;
  }
  
  .main-content {
    flex-direction: column;
    gap: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
  }
  
  /* Fixed visualization at top */
  .visualization-wrapper {
    order: 1;
    width: 100%;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--bg-primary);
  }
  
  .visualization-container {
    width: 100%;
    height: 45vw;
    min-height: 200px;
    max-height: 300px;
    aspect-ratio: unset;
    border-radius: 0;
    border-left: none;
    border-right: none;
    border-top: none;
  }
  
  #visualization-canvas {
    width: 100%;
    height: 100%;
  }
  
  /* Scrollable controls below */
  .control-panel {
    width: 100%;
    order: 2;
    padding: 1rem;
    gap: 1rem;
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    border-radius: 0;
    border-left: none;
    border-right: none;
    border-bottom: none;
  }
  
  .control-section {
    gap: 0.5rem;
  }
  
  .control-section h3 {
    font-size: 0.7rem;
    margin-bottom: 0.125rem;
  }
  
  /* Source buttons in 2x2 grid on mobile */
  .source-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
  }
  
  .source-buttons .btn {
    min-width: unset;
    padding: 0.75rem 0.5rem;
    font-size: 0.85rem;
  }
  
  /* Capture buttons side by side */
  .capture-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
  }
  
  .capture-buttons .btn {
    padding: 0.75rem 0.5rem;
    font-size: 0.85rem;
  }
  
  /* Color controls stack on mobile */
  .color-controls {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  
  /* Slider adjustments for mobile */
  .slider-label {
    font-size: 0.8rem;
  }
  
  /* Fullscreen button smaller on mobile */
  .fullscreen-btn {
    top: 0.5rem;
    right: 0.5rem;
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }
  
  .canvas-controls {
    top: 0.5rem;
    right: 0.5rem;
    gap: 0.375rem;
  }
  
  .canvas-control-btn {
    width: 36px;
    height: 36px;
    font-size: 0.8rem;
  }
  
  input[type="range"] {
    height: 8px;
  }
  
  input[type="range"]::-webkit-slider-thumb {
    width: 24px;
    height: 24px;
  }
  
  input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
  }
  
  /* Footer mobile */
  .footer {
    padding: 1.25rem 1rem;
  }
  
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
  }
  
  .footer-links a {
    font-size: 0.8rem;
  }
  
  /* YouTube controls mobile */
  .youtube-input-container {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .youtube-url-input {
    width: 100%;
  }
  
  #youtube-load-btn {
    width: 100%;
  }
  
  /* File controls mobile */
  .file-drop-zone {
    padding: 1.25rem 1rem;
  }
  
  .playback-buttons .btn-icon {
    width: 44px;
    height: 44px;
  }
}

/* Extra small devices (< 480px) */
@media (max-width: 479px) {
  .control-panel {
    padding: 0.875rem;
    gap: 0.875rem;
  }
  
  .visualization-container {
    height: 50vw;
    min-height: 180px;
    max-height: 250px;
  }
  
  .source-buttons .btn {
    padding: 0.625rem 0.375rem;
    font-size: 0.8rem;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 0.75rem;
  }
}

/* Landscape orientation on mobile - side by side layout */
@media (max-width: 767px) and (orientation: landscape) {
  .app-container {
    height: 100vh;
    height: 100dvh;
  }
  
  .main-content {
    flex-direction: row;
    height: 100%;
    overflow: hidden;
  }
  
  .visualization-wrapper {
    position: relative;
    flex: 0 0 auto;
    width: 50%;
    max-width: 50%;
    height: 100%;
    background: var(--bg-primary);
  }
  
  .visualization-container {
    width: 100%;
    height: 100%;
    max-height: 100%;
    border-radius: 0;
    border: none;
    border-right: 1px solid var(--border-color);
  }
  
  .control-panel {
    flex: 1;
    width: 50%;
    height: 100%;
    max-height: 100%;
    overflow-y: auto;
    border-radius: 0;
  }
}

/* Accessibility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

*:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}


/* File Upload Controls */
.hidden-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.file-drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1.5rem 1rem;
  background: var(--bg-tertiary);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.file-drop-zone:hover,
.file-drop-zone.drag-over {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.1);
}

.file-drop-zone:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.file-drop-zone .drop-icon {
  font-size: 1.5rem;
}

.file-drop-zone .drop-text {
  font-size: 0.75rem;
  color: var(--text-secondary);
  word-break: break-word;
  max-width: 100%;
}

.file-drop-zone.has-file .drop-text {
  color: var(--accent-primary);
  font-weight: 500;
}

/* Playback Controls */
.playback-controls {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.playback-buttons {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
}

.playback-buttons .btn-icon {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  font-size: 1rem;
}

.playback-buttons .btn-icon:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.playback-buttons .btn-icon.playing {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.progress-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.time-display {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  min-width: 35px;
}

.seek-slider {
  flex: 1;
}

/* File controls section visibility */
.file-controls {
  animation: fadeIn var(--transition-normal);
}

/* Volume controls */
.volume-controls {
  -webkit-animation: fadeIn var(--transition-normal);
  animation: fadeIn var(--transition-normal);
}

.oscillator-controls {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.oscillator-play-btn {
  -webkit-box-flex: 1;
  -ms-flex: 1;
  flex: 1;
  font-size: 1rem;
  min-width: 80px;
}

.oscillator-play-btn.playing {
  background: var(--error);
}

.oscillator-mode-toggle {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}


/* YouTube Controls */
.youtube-controls {
  animation: fadeIn var(--transition-normal);
}

.youtube-input-container {
  display: flex;
  gap: 0.5rem;
}

.youtube-url-input {
  flex: 1;
  padding: 0.625rem 0.75rem;
  font-size: 0.875rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition-fast);
}

.youtube-url-input::placeholder {
  color: var(--text-muted);
}

.youtube-url-input:focus {
  border-color: var(--accent-primary);
}

.youtube-url-input.error {
  border-color: var(--error);
}

.youtube-player-container {
  margin-top: 0.75rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-tertiary);
}

.youtube-player-container iframe {
  display: block;
  width: 100%;
  border-radius: var(--radius-md);
}

.youtube-hint {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  line-height: 1.4;
}

.youtube-error {
  padding: 0.75rem;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--error);
  border-radius: var(--radius-md);
  color: var(--error);
  font-size: 0.8rem;
  margin-top: 0.5rem;
}


/* ============================================
   TOUCH COMPATIBILITY
   ============================================ */

/* Ensure minimum touch target sizes (44x44px recommended by WCAG) */
@media (pointer: coarse) {
  /* Buttons touch targets */
  .btn {
    min-height: 44px;
    min-width: 44px;
    padding: 0.75rem 1rem;
  }
  
  .btn-icon {
    width: 48px;
    height: 48px;
  }
  
  /* Source buttons */
  .source-buttons .btn {
    min-height: 48px;
    padding: 0.875rem 0.75rem;
  }
  
  /* Capture buttons */
  .capture-buttons .btn {
    min-height: 48px;
  }
  
  /* Toggle switch larger for touch */
  .toggle {
    width: 52px;
    height: 28px;
  }
  
  .toggle-slider::before {
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
  }
  
  .toggle input:checked + .toggle-slider::before {
    transform: translateX(24px);
  }
  
  /* Color picker larger touch target */
  input[type="color"] {
    width: 48px;
    height: 48px;
  }
  
  /* Range slider thumb larger for touch */
  input[type="range"] {
    height: 10px;
  }
  
  input[type="range"]::-webkit-slider-thumb {
    width: 28px;
    height: 28px;
  }
  
  input[type="range"]::-moz-range-thumb {
    width: 28px;
    height: 28px;
  }
  
  /* File drop zone larger touch area */
  .file-drop-zone {
    min-height: 80px;
    padding: 1.5rem 1rem;
  }
  
  /* Playback buttons */
  .playback-buttons .btn-icon {
    width: 52px;
    height: 52px;
    font-size: 1.25rem;
  }
  
  /* YouTube load button */
  #youtube-load-btn {
    min-height: 44px;
    min-width: 80px;
  }
  
  /* YouTube URL input */
  .youtube-url-input {
    min-height: 44px;
    font-size: 16px; /* Prevents zoom on iOS */
  }
  
  /* Canvas control buttons */
  .canvas-control-btn {
    width: 44px;
    height: 44px;
    font-size: 1rem;
  }
  
  /* Footer links */
  .footer-links a {
    padding: 0.5rem;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
}

/* Touch-active state for sliders */
input[type="range"].touch-active::-webkit-slider-thumb {
  transform: scale(1.2);
  box-shadow: 0 0 15px var(--accent-glow), 0 0 25px var(--accent-glow);
}

input[type="range"].touch-active::-moz-range-thumb {
  transform: scale(1.2);
  box-shadow: 0 0 15px var(--accent-glow), 0 0 25px var(--accent-glow);
}

/* Prevent text selection during touch interactions */
.control-panel {
  -webkit-user-select: none;
  user-select: none;
}

/* Allow text selection in about section */
.about-inline {
  -webkit-user-select: text;
  user-select: text;
}

/* Improve tap highlight on mobile */
.btn,
.toggle,
.file-drop-zone,
input[type="color"],
input[type="range"] {
  -webkit-tap-highlight-color: rgba(99, 102, 241, 0.2);
}

/* Disable hover effects on touch devices to prevent sticky states */
@media (hover: none) {
  .btn:hover {
    background: inherit;
    box-shadow: none;
  }
  
  .btn-primary:hover {
    background: var(--accent-primary);
  }
  
  .btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
  }
  
  .source-buttons .btn.active:hover {
    background: var(--accent-primary);
  }
  
  input[type="range"]::-webkit-slider-thumb:hover {
    transform: none;
  }
  
  .file-drop-zone:hover {
    border-color: var(--border-color);
    background: var(--bg-tertiary);
  }
}

/* Active states for touch feedback */
@media (hover: none) {
  .btn:active {
    transform: scale(0.97);
    opacity: 0.9;
  }
  
  .btn-primary:active {
    background: var(--accent-secondary);
  }
  
  .btn-secondary:active {
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
  }
  
  .file-drop-zone:active {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
  }
}

/* Smooth scrolling for touch devices */
@media (pointer: coarse) {
  .control-panel {
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
  }
  
  html {
    scroll-behavior: smooth;
  }
}


/* Detected Frequency Display */
.detected-frequency {
  animation: fadeIn var(--transition-normal);
}

.detected-freq-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-primary);
  text-align: center;
  padding: 0.75rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  font-variant-numeric: tabular-nums;
  border: 1px solid var(--border-color);
}

.detected-freq-hint {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 0.5rem;
}

/* Frequency controls visibility */
.frequency-controls {
  animation: fadeIn var(--transition-normal);
}


/* Share Button */
.share-btn {
  width: 100%;
  margin-top: 0.75rem;
  background: #000000;
  border: 1px solid #333;
  color: var(--text-primary);
  font-weight: 600;
}

.share-btn:hover:not(:disabled) {
  background: #1a1a1a;
  border-color: var(--text-secondary);
}

.share-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.share-btn.has-capture {
  background: #000000;
  border-color: var(--accent-primary);
}

.share-btn.has-capture:hover {
  background: #1a1a1a;
  box-shadow: 0 0 10px var(--accent-glow);
}


/* Laser Count Controls */
.laser-count-controls {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.laser-count-controls .slider-container {
  flex: 1;
}

.laser-count-controls .pulse-toggle {
  margin-top: 0.25rem;
}

/* Visual Effects Section */
.effects-section {
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin: -0.5rem;
  margin-top: 0;
}

.effect-group {
  margin-bottom: 0.875rem;
  padding-bottom: 0.875rem;
  border-bottom: 1px solid var(--border-color);
}

.effect-group:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.effect-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.effect-row .mini-slider {
  flex: 1;
  margin-left: 0.5rem;
  max-width: 120px;
  height: 4px;
}

/* Fade Timer Display */
.fade-timer-display {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-primary);
  min-width: 40px;
  text-align: right;
}

.effect-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.effect-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.toggle-container.compact {
  gap: 0.5rem;
}

.toggle-container.compact span {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.slider-value.compact {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-primary);
  min-width: 24px;
  text-align: center;
}

/* Rotation Buttons */
.rotation-buttons {
  display: flex;
  gap: 0.25rem;
}

/* Animation Mode Buttons */
.animation-mode-buttons {
  display: flex;
  gap: 0.25rem;
}

/* Symmetry Buttons */
.symmetry-buttons {
  display: flex;
  gap: 0.25rem;
}

/* Wave Symmetry Controls */
.wave-symmetry-controls {
  margin-top: 0.5rem;
}

.btn-mini {
  padding: 0.375rem 0.625rem;
  font-size: 0.75rem;
  min-width: unset;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.btn-mini:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.btn-mini.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
}

/* Mirror number input */
.mirror-number-input {
  width: 50px;
  padding: 0.375rem 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-align: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--accent-primary);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  appearance: textfield;
  -moz-appearance: textfield;
}

.mirror-number-input::-webkit-outer-spin-button,
.mirror-number-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.mirror-number-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 8px var(--accent-glow);
}

.mirror-number-input:hover {
  border-color: var(--accent-primary);
}

/* Touch device adjustments for mirror input */
@media (pointer: coarse) {
  .mirror-number-input {
    min-height: 44px;
    width: 60px;
    font-size: 16px; /* Prevents zoom on iOS */
  }
}

/* Pulsing slider animation */
input[type="range"].pulsing {
  animation: sliderPulse 2s ease-in-out infinite;
}

@keyframes sliderPulse {
  0%, 100% {
    filter: brightness(1);
  }
  50% {
    filter: brightness(1.3);
  }
}

input[type="range"].pulsing::-webkit-slider-thumb {
  animation: thumbPulse 2s ease-in-out infinite;
}

input[type="range"].pulsing::-moz-range-thumb {
  animation: thumbPulse 2s ease-in-out infinite;
}

@keyframes thumbPulse {
  0%, 100% {
    box-shadow: 0 0 10px var(--accent-glow);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 0 20px var(--accent-glow), 0 0 30px var(--accent-glow);
    transform: scale(1.15);
  }
}

/* Mobile adjustments for effects section */
@media (max-width: 767px) {
  .effects-section {
    padding: 0.875rem;
  }
  
  .effect-row {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .rotation-buttons {
    flex-wrap: wrap;
  }
  
  .btn-mini {
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
  }
}


/* ============================================
   SAND MODE CONTROLS
   ============================================ */

/* Sand Controls Container */
.sand-controls {
  animation: fadeIn var(--transition-normal);
  margin-top: 0.5rem;
}

/* Sand control sliders - consistent spacing */
.sand-controls input[type="range"] {
  margin-top: 0.25rem;
  margin-bottom: 0.5rem;
}

/* Sand control labels */
.sand-controls .effect-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  min-width: 80px;
}

/* Sand control value displays */
.sand-controls .slider-value.compact {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-primary);
  min-width: 50px;
  text-align: right;
}

/* Plate Shape Selector */
.shape-select {
  padding: 0.375rem 0.625rem;
  font-size: 0.8rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-width: 100px;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23a0a0b0' d='M3 4.5L6 8l3-3.5H3z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
  padding-right: 1.75rem;
}

.shape-select:hover {
  border-color: var(--accent-primary);
}

.shape-select:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 8px var(--accent-glow);
}

.shape-select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.5rem;
}

/* Sand Color Pickers */
.sand-controls input[type="color"] {
  width: 36px;
  height: 36px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.sand-controls input[type="color"]:hover {
  border-color: var(--accent-primary);
}

.sand-controls input[type="color"]:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 8px var(--accent-glow);
}

/* Sand Trails Toggle */
.sand-controls .toggle-container.compact {
  gap: 0.5rem;
}

.sand-controls .toggle-container.compact span {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ============================================
   MODE NUMBER DISPLAY
   ============================================ */

/* Mode Number Display Container */
.mode-number-display {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(99, 102, 241, 0.1) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.625rem 0.875rem;
  margin-top: 0.75rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.mode-number-display:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

/* Mode Numbers Container */
.mode-numbers {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.125rem;
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 'Consolas', monospace;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  padding: 0.375rem 0.75rem;
  min-width: 70px;
}

/* Mode Value Numbers */
.mode-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-primary);
  min-width: 1.5rem;
  text-align: center;
  transition: color var(--transition-fast), transform var(--transition-fast), text-shadow var(--transition-fast);
  text-shadow: 0 0 8px var(--accent-glow);
}

/* Mode Value Change Animation */
.mode-value.changed {
  animation: modeValuePulse 0.4s ease-out;
}

@keyframes modeValuePulse {
  0% {
    transform: scale(1);
    color: var(--accent-primary);
    text-shadow: 0 0 8px var(--accent-glow);
  }
  30% {
    transform: scale(1.3);
    color: var(--accent-secondary);
    text-shadow: 0 0 16px var(--accent-glow), 0 0 24px rgba(139, 92, 246, 0.5);
  }
  100% {
    transform: scale(1);
    color: var(--accent-primary);
    text-shadow: 0 0 8px var(--accent-glow);
  }
}

/* Mode Separator */
.mode-separator {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-muted);
  margin: 0 0.125rem;
}

/* Mode Number Label */
.mode-number-display .effect-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

/* ============================================
   SAND CONTROLS RESPONSIVE STYLES
   ============================================ */

/* Touch device adjustments for sand controls */
@media (pointer: coarse) {
  .shape-select {
    min-height: 44px;
    font-size: 16px; /* Prevents zoom on iOS */
    padding: 0.5rem 0.75rem;
    padding-right: 2rem;
  }
  
  .sand-controls input[type="color"] {
    width: 48px;
    height: 48px;
  }
  
  .sand-controls input[type="range"] {
    height: 10px;
  }
  
  .sand-controls input[type="range"]::-webkit-slider-thumb {
    width: 28px;
    height: 28px;
  }
  
  .sand-controls input[type="range"]::-moz-range-thumb {
    width: 28px;
    height: 28px;
  }
}

/* Tablet adjustments for sand controls */
@media (min-width: 768px) and (max-width: 1024px) {
  .sand-controls .effect-label {
    font-size: 0.75rem;
    min-width: 70px;
  }
  
  .sand-controls .slider-value.compact {
    font-size: 0.85rem;
    min-width: 45px;
  }
  
  .mode-value {
    font-size: 1.1rem;
  }
}

/* Mobile adjustments for sand controls */
@media (max-width: 767px) {
  .sand-controls {
    margin-top: 0.25rem;
  }
  
  .sand-controls .effect-row {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .sand-controls .effect-label {
    min-width: 100%;
    margin-bottom: 0.25rem;
  }
  
  .sand-controls .slider-value.compact {
    position: absolute;
    right: 0;
    top: 0;
  }
  
  .sand-controls .effect-row {
    position: relative;
  }
  
  .shape-select {
    width: 100%;
    min-width: unset;
  }
  
  .sand-controls input[type="color"] {
    width: 44px;
    height: 44px;
  }
  
  /* Mode number display mobile */
  .mode-number-display {
    padding: 0.5rem 0.75rem;
  }
  
  .mode-numbers {
    padding: 0.25rem 0.5rem;
    min-width: 60px;
  }
  
  .mode-value {
    font-size: 1rem;
    min-width: 1.25rem;
  }
  
  .mode-separator {
    font-size: 0.9rem;
  }
}

/* Extra small devices */
@media (max-width: 479px) {
  .sand-controls .effect-row {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .sand-controls .toggle-container.compact {
    margin-top: 0.25rem;
  }
  
  .mode-number-display .effect-label {
    font-size: 0.7rem;
  }
}

/* Landscape mobile adjustments */
@media (max-width: 767px) and (orientation: landscape) {
  .sand-controls .effect-row {
    flex-wrap: nowrap;
  }
  
  .sand-controls .effect-label {
    min-width: 70px;
  }
}